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Meteorological data in GRIB format

The Meteorological Service of Canada makes this GRIB2 format
database available to private sector meteorologists, academics, and the
general public. It contains data from analysis systems along with
output from many of the Canadian Meteorological Centre's Numerical
Weather Prediction (NWP) models. The data is free, under standard
terms and conditions.

Dataset description and access

If you make use of Environment Canada GRIB data, we encourage you to
subscribe to our distribution list in order to receive timely
information regarding future changes that may have an impact on the way
you collect or use our data:
http://lists.ec.gc.ca/mailman/listinfo/dd_info